Wagmi is a TypeScript-based React Hooks library for Ethereum applications. It provides over 40 hooks for wallet connections, contract interactions, transactions, and ENS support. Built on Viem and integrated with TanStack Query, Wagmi offers features like caching, deduplication, and persistence. It supports multiple wallets, including MetaMask, WalletConnect, and Coinbase Wallet, and is designed for modularity and type safety.